MAINTENANCE
Honeywell !MEJ+AAW
9. B. (3) Annunciators -
The six annunciators located at the top of the CDU
keyboard panel operate independently from the CRT and keyboard.
Lighting of the annunciators is initiated by the navigation computer
or performance computer via the RS422 serial data link. The two
colors used for annunciations are white and amber.
White indicates
an advisory type annunciation, and amber indicates an alerting type
annunciation.
The following paragraphs describe each annunciator:
(a) Display (DSPLY) Annunciator - The DSPLY annunciator is an
advisory type (white) that lights when the CDU is displaying a
page that is not relative to the
current aircraft lateral or
vertical flightpath.
The DSPLY annunciator will light under
the following conditions:
● When displaying a flight plan page other than page 1.
. When displaying a stored flight plan page.
. When displaying any of the review pages for SIDS and STARS.
● When displaying the ‘CHANGE ACTIVE LEG’ message.
. When defining the ‘Intercept’ waypoint on the active leg.
(b) Dead Reckoning (DR) Annunciator - The DR annunciator is an
alerting type (amber) that lights when the FMS is navigating
via the DR mode which is defined to be the loss of radio
updating and the loss of all position sensors.
The DR
annunciator will light under the following conditions:
● When the FMS has been operating in the DR mode for longer
than 3 minutes.
. When the APRCH annunciator is illuminated and position
updating from all sources is lost for more than 30 seconds
and the radio is not procedure tuned.
s When the APRCH annunciator is illuminated and position
updating from all sources is lost for more than 5 seconds
and the radio is procedure tuned.
(c) Degraded (DGRAD) Annunciator - The DGRAD
annunciator is an
advisory type (white) that lights
when the FMS has entered a
degraded navigation mode.
The definition of degraded is when
the FMS cannot guarantee the required accuracy for the present
segment of flight.
The DGRAD annunciator will light under the
following conditions:
22-14-00
Page 198.130
Aug 15/91
Use or disclosure of reformation on this page is subject to the restrictions on the title page of this document,
To Next Page
Loading...
